ref: 4b402746cad6f9dbebbb3c3b79a2da098385d46f
dir: /vp8/encoder/arm/neon/vp8_shortwalsh4x4_neon.c/
/*
* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <arm_neon.h>
#include "vpx_ports/arm.h"
#ifdef VPX_INCOMPATIBLE_GCC
#include "./vp8_rtcd.h"
void vp8_short_walsh4x4_neon(int16_t *input, int16_t *output, int pitch) {
vp8_short_walsh4x4_c(input, output, pitch);
}
#else
void vp8_short_walsh4x4_neon(int16_t *input, int16_t *output, int pitch) {
uint16x4_t d16u16;
int16x8_t q0s16, q1s16;
int16x4_t dEmptys16, d0s16, d1s16, d2s16, d3s16, d4s16, d5s16, d6s16, d7s16;
int32x4_t qEmptys32, q0s32, q1s32, q2s32, q3s32, q8s32;
int32x4_t q9s32, q10s32, q11s32, q15s32;
uint32x4_t q8u32, q9u32, q10u32, q11u32;
int16x4x2_t v2tmp0, v2tmp1;
int32x2x2_t v2tmp2, v2tmp3;
dEmptys16 = vdup_n_s16(0);
qEmptys32 = vdupq_n_s32(0);
q15s32 = vdupq_n_s32(3);
d0s16 = vld1_s16(input);
input += pitch / 2;
d1s16 = vld1_s16(input);
input += pitch / 2;
d2s16 = vld1_s16(input);
input += pitch / 2;
d3s16 = vld1_s16(input);
v2tmp2 = vtrn_s32(vreinterpret_s32_s16(d0s16), vreinterpret_s32_s16(d2s16));
v2tmp3 = vtrn_s32(vreinterpret_s32_s16(d1s16), vreinterpret_s32_s16(d3s16));
v2tmp0 = vtrn_s16(vreinterpret_s16_s32(v2tmp2.val[0]), // d0
vreinterpret_s16_s32(v2tmp3.val[0])); // d1
v2tmp1 = vtrn_s16(vreinterpret_s16_s32(v2tmp2.val[1]), // d2
vreinterpret_s16_s32(v2tmp3.val[1])); // d3
d4s16 = vadd_s16(v2tmp0.val[0], v2tmp1.val[0]);
d5s16 = vadd_s16(v2tmp0.val[1], v2tmp1.val[1]);
d6s16 = vsub_s16(v2tmp0.val[1], v2tmp1.val[1]);
d7s16 = vsub_s16(v2tmp0.val[0], v2tmp1.val[0]);
d4s16 = vshl_n_s16(d4s16, 2);
d5s16 = vshl_n_s16(d5s16, 2);
d6s16 = vshl_n_s16(d6s16, 2);
d7s16 = vshl_n_s16(d7s16, 2);
d16u16 = vceq_s16(d4s16, dEmptys16);
d16u16 = vmvn_u16(d16u16);
d0s16 = vadd_s16(d4s16, d5s16);
d3s16 = vsub_s16(d4s16, d5s16);
d1s16 = vadd_s16(d7s16, d6s16);
d2s16 = vsub_s16(d7s16, d6s16);
d0s16 = vsub_s16(d0s16, vreinterpret_s16_u16(d16u16));
// Second for-loop
v2tmp2 = vtrn_s32(vreinterpret_s32_s16(d1s16), vreinterpret_s32_s16(d3s16));
v2tmp3 = vtrn_s32(vreinterpret_s32_s16(d0s16), vreinterpret_s32_s16(d2s16));
v2tmp0 = vtrn_s16(vreinterpret_s16_s32(v2tmp3.val[1]), // d2
vreinterpret_s16_s32(v2tmp2.val[1])); // d3
v2tmp1 = vtrn_s16(vreinterpret_s16_s32(v2tmp3.val[0]), // d0
vreinterpret_s16_s32(v2tmp2.val[0])); // d1
q8s32 = vaddl_s16(v2tmp1.val[0], v2tmp0.val[0]);
q9s32 = vaddl_s16(v2tmp1.val[1], v2tmp0.val[1]);
q10s32 = vsubl_s16(v2tmp1.val[1], v2tmp0.val[1]);
q11s32 = vsubl_s16(v2tmp1.val[0], v2tmp0.val[0]);
q0s32 = vaddq_s32(q8s32, q9s32);
q1s32 = vaddq_s32(q11s32, q10s32);
q2s32 = vsubq_s32(q11s32, q10s32);
q3s32 = vsubq_s32(q8s32, q9s32);
q8u32 = vcltq_s32(q0s32, qEmptys32);
q9u32 = vcltq_s32(q1s32, qEmptys32);
q10u32 = vcltq_s32(q2s32, qEmptys32);
q11u32 = vcltq_s32(q3s32, qEmptys32);
q8s32 = vreinterpretq_s32_u32(q8u32);
q9s32 = vreinterpretq_s32_u32(q9u32);
q10s32 = vreinterpretq_s32_u32(q10u32);
q11s32 = vreinterpretq_s32_u32(q11u32);
q0s32 = vsubq_s32(q0s32, q8s32);
q1s32 = vsubq_s32(q1s32, q9s32);
q2s32 = vsubq_s32(q2s32, q10s32);
q3s32 = vsubq_s32(q3s32, q11s32);
q8s32 = vaddq_s32(q0s32, q15s32);
q9s32 = vaddq_s32(q1s32, q15s32);
q10s32 = vaddq_s32(q2s32, q15s32);
q11s32 = vaddq_s32(q3s32, q15s32);
d0s16 = vshrn_n_s32(q8s32, 3);
d1s16 = vshrn_n_s32(q9s32, 3);
d2s16 = vshrn_n_s32(q10s32, 3);
d3s16 = vshrn_n_s32(q11s32, 3);
q0s16 = vcombine_s16(d0s16, d1s16);
q1s16 = vcombine_s16(d2s16, d3s16);
vst1q_s16(output, q0s16);
vst1q_s16(output + 8, q1s16);
return;
}
#endif // VPX_INCOMPATIBLE_GCC